CN111472839B - Comprehensive seepage control-based quantitative calculation method for water discharge of water-rich tunnel construction - Google Patents
Comprehensive seepage control-based quantitative calculation method for water discharge of water-rich tunnel construction Download PDFInfo
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- CN111472839B CN111472839B CN202010404008.XA CN202010404008A CN111472839B CN 111472839 B CN111472839 B CN 111472839B CN 202010404008 A CN202010404008 A CN 202010404008A CN 111472839 B CN111472839 B CN 111472839B
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- E21—EARTH DRILLING; MINING
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Abstract
The technical scheme adopted by the invention is as follows: a method for quantitatively calculating the water discharge of water-rich tunnel construction based on comprehensive seepage control comprises the following steps: a. acquiring estimation data of natural water inflow of each geological section under natural conditions along the tunnel, and obtaining boundary conditions of allowable water seepage and inflow required by tunnel construction and allowable water seepage and inflow of functional environment of the tunnel; b. based on the seepage control measures taken by each geological section of the tunnel, calculating the reduction coefficient of the seepage and water inflow amount of the tunnel under the corresponding seepage control measures by adopting a numerical simulation technology; c. calculating the seepage and gushing water quantity after seepage control of each geological section along the tunnel and the accumulated seepage and gushing water quantity along the tunnel based on the reduction coefficient of each geological section; d. determining the water discharge from the tunnel construction to the tunnel face as the accumulated seepage water along the way plus the construction wastewater generated by external water supply; e. and selecting the maximum value of the water discharge from the tunnel construction to the tunnel face as the water discharge resource allocation basis. The invention can obtain a relatively reliable tunnel construction displacement calculation result.
Description
Technical Field
The invention relates to the technical field of underground engineering, in particular to a comprehensive seepage control-based quantitative calculation method for water-rich tunnel construction displacement.
Background
In recent years, with the large-scale shift of infrastructure construction of China to western regions, tunnel engineering, particularly deep-buried long tunnel engineering, in the fields of railways, highways, water conservancy and the like is increasing day by day. However, due to the limitation of landform and construction conditions, the long tunnel cannot avoid crossing complex unfavorable geological strata when the line is selected. When the tunnel passes through a water-rich stratum such as a soluble rock stratum or a water system communication fault fracture zone, a great gushing risk exists, so that underground water control and discharge are fully considered in a design stage, and the tunnel is particularly important for protecting underground water environment and controlling construction safety. But the engineering industry has no unified tunnel construction period water discharge calculation standard all the time; because of lack of quantitative calculation, the drainage cost in the construction period is generally listed in other engineering costs, and the cost is easy to exceed the probability in the construction process of the water-rich tunnel; in severe cases, serious flooding safety accidents caused by insufficient allocation of drainage resources can occur, and a plurality of negative effects such as life and property loss, construction period delay and the like can be caused.
Disclosure of Invention
The invention aims to provide a method for quantitatively calculating the water-rich tunnel construction displacement based on comprehensive seepage control to obtain a relatively reliable tunnel construction displacement calculation result aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a method for quantitatively calculating the water discharge of water-rich tunnel construction based on comprehensive seepage control is characterized by comprising the following steps:
a. acquiring estimation data of natural water inflow of each geological section under natural conditions along the tunnel, and obtaining boundary conditions of allowable water seepage and inflow required by tunnel construction and allowable water seepage and inflow of functional environment of the tunnel;
b. based on the seepage control measures taken by each geological section of the tunnel, calculating the reduction coefficient of the seepage and water inflow amount of the tunnel under the corresponding seepage control measures by adopting a numerical simulation technology;
c. calculating the seepage and gushing water quantity after seepage control of each geological section along the tunnel and the accumulated seepage and gushing water quantity along the tunnel based on the reduction coefficient of each geological section;
d. determining the water discharge from the tunnel construction to the tunnel face as the accumulated seepage water along the way plus the construction wastewater generated by external water supply;
e. and selecting the maximum value of the water discharge from the tunnel construction to the tunnel face as the water discharge resource allocation basis.
In the above technical solution, step c further includes the following steps: the seepage and water inflow amount and the on-way accumulated seepage and water inflow amount after seepage control of each geological section of the tunnel on the way are counted, the maximum value is respectively taken and compared with the boundary condition of the allowable seepage and water inflow amount of the functional environment of the tunnel and the allowable seepage and water inflow amount required by tunnel construction for rechecking; if the seepage and inflow amount after the seepage control of each geological section and the accumulated seepage and inflow amount along the way are larger than the boundary condition of the allowable seepage and inflow amount of the functional environment of the tunnel or the allowable seepage and inflow amount required by the construction of the tunnel, adjusting the seepage control measures and repeating the steps b and c; and d, if the seepage and inflow amount after seepage control of each geological section and the accumulated seepage and inflow amount along the way are less than or equal to the boundary condition of the allowable seepage and inflow amount of the functional environment of the tunnel and the allowable seepage and inflow amount required by tunnel construction, performing step d.
In the technical scheme, the construction wastewater generated by the external water supply is relatively fixed and small, and is generally ignored.
In the above technical solution, step c includes the following steps:
and (3) dynamically calculating the seepage and water inflow amount of the tunnel along the way in a segmented manner: wherein Q ism＝Q0mξim，Qn＝Σ(Q0mξim) (ii) a Wherein QmThe water inflow after the seepage control of the mth section; q0mThe natural seepage water volume of the mth section in the excavated tunnel section; xiimAdopting seepage control measure K in mth section of on-way geological section of corresponding tunneliThe reduction coefficient of the water seepage and inflow amount of the tunnel; qn is the accumulated seepage and water inflow along the way when the pile number n of the tunnel face is excavated.
In the technical scheme, the allowable seepage water amount meeting the tunnel construction requirement is calculated according to the site construction requirement.
In the technical scheme, the seepage control measures are determined according to the allowable seepage and inflow amount of the tunnel function and the allowable seepage and inflow amount of the construction.
In the above technical scheme, in the step b, a three-dimensional seepage model is adopted to simulate the seepage field of different rock stratums with different permeabilities after seepage control measures are takenTo obtain each penetration control measure KiThe seepage water amount of the lower tunnel; the ratio of this quantity to the natural seepage water quantity under the corresponding natural conditions is defined as the seepage control measure KiDiversion coefficient xi of water inflow amount of lower tunneli。
Aiming at the defects of the prior art, the invention provides the tunnel construction displacement calculation method which has feasible technology, simple and convenient calculation and relatively reliable result under the condition of fully utilizing comprehensive seepage control measures. The method is suitable for tunnel construction seepage control decision and construction displacement quantitative calculation under the condition of rich water, has the technical advantages of feasible technology, simple and convenient calculation, safety and reliability, can optimally select proper seepage control measures meeting tunnel construction requirements and tunnel functional environment requirements aiming at the rich water tunnel, is convenient to configure drainage resources meeting drainage safety, can consider enough investment in an early design stage, avoids the phenomenon of over-probability of construction cost in an implementation stage, reduces construction risks, avoids major flooding safety accidents caused by insufficient drainage resource configuration, and is favorable for guaranteeing life and property safety and guaranteeing construction period.
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FIG. 1 is a schematic diagram of the computational principles of the present invention;
FIG. 2 is a schematic of the calculation flow of the present invention
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1, the construction method is divided into a plurality of construction sections for a certain deep-buried long tunnel project, wherein a single-head tunneling length 2138m of a certain water-rich tunnel section is divided into 4 sections according to hydrogeological conditions in the tunneling direction. The calculation principle is schematically shown in fig. 1, and the following flow of the calculation method shown in fig. 2 is further detailed as follows:
according to hydrogeological prospecting data, estimating data Q of water seepage and inflow amount under natural conditions along the tunnel section0m＝(16.61，10.26，5.65，15.10)m3(m.d), wherein m is 1-4. According to the water delivery function of the tunnel and the requirement of underground water environment protection, the corresponding allowable seepage water amount [ Qg]＝3.0m3/(m.d)。
(II) determining allowable seepage water amount [ Q ] meeting the tunnel construction requirements according to relevant specifications and by combining specific construction conditionss]1＝3.6m3/(m.d), it is also necessary to satisfy the requirement of allowing water seepage and inflow within a certain hole length near the face of the palm [ Qs]2＝0.1m3S, total water seepage and inflow in the whole tunnel section [ Q ]s]3＝0.3m3/s。
(III) according to the allowable seepage and water inflow amount of the tunnel function and the allowable seepage and water inflow amount of construction, the adopted seepage control measures are that 'the secondary lining is implemented by about 100m of a lagging tunnel face + the radial grouting and water plugging is implemented by about 100m of a lagging secondary lining', the primary support implemented immediately after excavation and the lagging secondary lining need to be buried for drainage, so the seepage control measures along the way towards the tunneling direction of the tunnel are respectively Ki(grouting water shutoff, natural water penetration of about 200m long), wherein i is 1, 0. The primary grouting material is common cement paste.
Fourthly, simulating the seepage field in different rock stratums with different permeabilities by adopting a three-dimensional seepage model after seepage control measures such as lining, grouting, draining and the like are adopted to obtain each seepage control measure KiThe seepage and water inflow of the lower tunnel, and the ratio of the seepage and water inflow under the corresponding natural condition is defined as a seepage control measure KiDiversion coefficient xi of water inflow amount of lower tunneli. Through the numerical simulation calculation, when the ordinary cement paste is poured,
when water is naturally seeped
And (V) based on the perfusion common cement slurry seepage control measure, calculating the seepage and water inflow quantity of the tunnel along the way in a segmented mode as follows: qm＝Q0mξim＝(10.34，4.75，2.58，9.58)m3/(m.d)。
(VI-1) statistical tunnelAccumulating the water seepage and inflow amount along each section of the process, and mixing with [ Q ]g]And [ Q ]s]And checking the value comparison. From (V), except Q3Satisfy the requirement, Q1、Q2And Q4If the requirements are not met, returning to the step (three) to readjust the seepage control measures of the 1 st section, the 2 nd section and the 4 th section.
And (sixthly-2) after research and analysis, secondary chemical grouting is adopted for the 1 st section and the 4 th section, and secondary superfine cement grouting is adopted for the 2 nd section.
(VI-3) calculating each penetration control measure K by adopting the numerical simulation technology in the step (IV)iReduction coefficient xi of water seepage and inflow amount of lower tunneli. After the adjustment of the seepage control measures, the water quality of the water quality control system is improved,
(i is 1-4) when water is naturally seeped
(VI-4) based on the adjusted seepage control measures of all the sections, calculating the seepage and water inflow quantity of the tunnel along the way in a segmented mode to obtain: qm＝Q0mξim＝(0.56，2.61，2.58，0.50)m3/(m.d)。
(VI-5) counting the accumulated seepage and inflow water quantity of each section of the tunnel along the way, and mixing with the (Q)g]And [ Q ]s]And checking the value comparison.
1) From (VI-4), the sectional water seepage and inflow after the seepage control measures are adopted all meet Qm≤[Qg]＝3.0m3/(m.d) and Qm≤[Qs]1＝3.6m3/(m.d).
2) After rechecking, the water seepage and inflow amount (0.038, 0.024, 0.013, 0.35) m of the un-grouted section in each section of the tunnel within 200m of the tunnel face3The/s also satisfies the condition that Q is less than or equal tos]2＝0.1m3Requirement of/s.
3) Advancing along the tunnel face, and counting accumulated seepage and gushing water of each section of the tunnel along the wayAmount, search out its maximum value to obtain (Q)n)MAX＝0.077m3/s≤[Qs]3＝0.3m3/s。
(VII) at the moment, the water discharge Q from the tunnel construction to the pile number n can be determinedpn＝Qn. Typical displacement for tunneling to the end of 4 segments is Qpn＝(0.009，0.013，0.073，0.077)m3/s。
(eighth) at QpnIn sequence with (Q)pn)MAXAs the maximum drainage resource allocation basis. In this embodiment, the maximum displacement (Q) of the construction period can be searched for in the seventh steppn)MAX＝0.077m3And/s, the maximum drainage resource allocation basis in the construction period of the tunnel section is used.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (6)
1. A method for quantitatively calculating the water discharge of water-rich tunnel construction based on comprehensive seepage control is characterized by comprising the following steps:
a. acquiring estimation data of natural water inflow of each geological section under natural conditions along the tunnel, and obtaining boundary conditions of allowable water seepage and inflow required by tunnel construction and allowable water seepage and inflow of functional environment of the tunnel;
b. based on the seepage control measures taken by each geological section of the tunnel, calculating the reduction coefficient of the seepage and water inflow amount of the tunnel under the corresponding seepage control measures by adopting a numerical simulation technology;
c. calculating the seepage and gushing water quantity after seepage control of each geological section along the tunnel and the accumulated seepage and gushing water quantity along the tunnel based on the reduction coefficient of each geological section;
d. determining the water discharge from the tunnel construction to the tunnel face as the accumulated seepage water along the way plus the construction wastewater generated by external water supply;
e. selecting the maximum value of the displacement from the tunnel construction to the tunnel face as the drainage resource allocation basis;
the step c further comprises the following steps: the seepage and water inflow amount and the on-way accumulated seepage and water inflow amount after seepage control of each geological section of the tunnel on the way are counted, the maximum value is respectively taken and compared with the boundary condition of the allowable seepage and water inflow amount of the functional environment of the tunnel and the allowable seepage and water inflow amount required by tunnel construction for rechecking; if the seepage and inflow amount after the seepage control of each geological section and the accumulated seepage and inflow amount along the way are larger than the boundary condition of the allowable seepage and inflow amount of the functional environment of the tunnel or the allowable seepage and inflow amount required by the construction of the tunnel, adjusting the seepage control measures and repeating the steps b and c; and d, if the seepage and inflow amount after seepage control of each geological section and the accumulated seepage and inflow amount along the way are less than or equal to the boundary condition of the allowable seepage and inflow amount of the functional environment of the tunnel and the allowable seepage and inflow amount required by tunnel construction, performing step d.
2. The comprehensive seepage control-based quantitative calculation method for the construction displacement of the water-rich tunnel according to claim 1, wherein construction wastewater generated by external water supply is a relatively fixed small amount and is ignored.
3. The comprehensive seepage control based quantitative calculation method for the construction displacement of the water-rich tunnel according to claim 1, wherein the step c comprises the following steps:
and (3) dynamically calculating the seepage and water inflow amount of the tunnel along the way in a segmented manner: wherein Q ism＝Q0mξim，Qn＝Σ(Q0mξim) (ii) a Wherein QmThe water inflow after the seepage control of the mth section; q0mThe natural seepage water volume of the mth section in the excavated tunnel section; xiimAdopting seepage control measure K in mth section of on-way geological section of corresponding tunneliThe reduction coefficient of the water seepage and inflow amount of the tunnel; qn is the accumulated seepage and water inflow along the way when the pile number n of the tunnel face is excavated.
4. The method for quantitatively calculating the water-rich tunnel construction displacement based on comprehensive seepage control according to claim 1, wherein the allowable seepage water amount meeting the tunnel construction requirement is calculated according to the site construction requirement.
5. The method for quantitatively calculating the construction displacement of the water-rich tunnel based on comprehensive seepage control as claimed in claim 1, wherein seepage control measures are determined according to the allowable seepage and inflow amount of the tunnel function and the allowable seepage and inflow amount of the construction.
6. The method for quantitatively calculating the water discharge of the water-rich tunnel construction based on the comprehensive seepage control as claimed in claim 1, wherein in the step b, a three-dimensional seepage model is adopted to simulate the seepage field of different rock stratums with different permeabilities after the seepage control measures are taken so as to obtain each seepage control measure KiThe water seepage and inflow amount of the lower tunnel; measures K for controlling each penetrationiThe ratio of the water seepage and inflow of the tunnel to the natural water seepage and inflow under the corresponding natural conditions is defined as a seepage control measure KiDiversion coefficient xi of water inflow amount of lower tunneli。
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